subject:(community respiration)

1. Ivancic, Torri A. The Effect of Warming and Simulated Rainfall on Soil Microbial Community Structure and Function.

Degree: 2015, Buffalo State College

URL: http://digitalcommons.buffalostate.edu/biology_theses/22

► Soil respiration, from plant roots and soil microbes, accounts for 60 – 80 percent of total ecosystem respiration, with the microbial component contributing approximately 54… (more)

Subjects/Keywords: Soil microbial respiration; temperature; rainfall; soil microbial community; Soil Science

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ivancic, T. A. (2015). The Effect of Warming and Simulated Rainfall on Soil Microbial Community Structure and Function. (Thesis). Buffalo State College. Retrieved from http://digitalcommons.buffalostate.edu/biology_theses/22

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ivancic, Torri A. “The Effect of Warming and Simulated Rainfall on Soil Microbial Community Structure and Function.” 2015. Thesis, Buffalo State College. Accessed December 13, 2019. http://digitalcommons.buffalostate.edu/biology_theses/22.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ivancic, Torri A. “The Effect of Warming and Simulated Rainfall on Soil Microbial Community Structure and Function.” 2015. Web. 13 Dec 2019.

Vancouver:

Ivancic TA. The Effect of Warming and Simulated Rainfall on Soil Microbial Community Structure and Function. [Internet] [Thesis]. Buffalo State College; 2015. [cited 2019 Dec 13]. Available from: http://digitalcommons.buffalostate.edu/biology_theses/22.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ivancic TA. The Effect of Warming and Simulated Rainfall on Soil Microbial Community Structure and Function. [Thesis]. Buffalo State College; 2015. Available from: http://digitalcommons.buffalostate.edu/biology_theses/22

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

NSYSU

2. Wang, Yu-chieh. Spatial and temporal variability of organic carbon metabolism in Kaoping Coastal Sea and northern South China Sea.

Degree: Master, Marine Geology and chemistry, 2005, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0804105-204017

► This study aims to understand the influence of hydrochemical and nutrient dynamics on the metabolism of organic carbon, and to explore the relationship between the… (more)

▼ This study aims to understand the influence of hydrochemical and nutrient dynamics on the metabolism of organic carbon, and to explore the relationship between the metabolism of organic carbon and air-sea fluxes of CO2 in the Kaoping coastal zone and the northern South China Sea (NSCS). Distributions of nutrients in the Kaoping Canyon increased generally with the increase of freshwater input from the Kaoping River that discharged the highest rate during the summer season. In the northern SCS, the enhanced nutrient distributions were caused by freshwater input or upwelling in coastal and shelf zones, and by vertical mixing in the central basin in winter. During the study periods, the integrated gross production (IGP) ranged from 1389 to 8918 mgC m-2d-1 in the Kaoping Canyon, and from 851 to 5032 mgC m-2d-1 in the NSCS. The integrated dark community respiration (IDCR) ranged from 919 to 5848 mgC m-2d-1 in the Kaoping Canyon, and from 435 to 10707 mgC m-2d-1 in the NSCS. The higher IGP was found in summer than in winter for both study areas, primarily due to greater inputs of freshwater from the Kaoping River and/or from the Pearl River. The deeper euphotic depth may be also responsible for higher IGP in the central basin during the summer season. Positive correlations are significant between GP (DCR) and temperature, PAR and nutrients, and negative correlations are also significant between GP (DCR) and salinity, showing the significant impacts of freshwater inputs and climatic changes on GP (DCR). However, GP was determined largely by DCR, and DCR was attributed mainly to BR (bacteria respiration) for both the Kaoping Canyon (ave., 78%) and the NSCS (ave., 65%). In addition, the ratio of IBR/IDCR ranged from 48 to 88% for the Kaoping Canyon and from 58 to 88% for the NSCS. The ratio of IGP/IDCR is an indicator of net ecosystem production, with >1 for the autotrophic system and <1 for the heterotrophic system. The ratio was greater than 1.0 for most stations during summer but was <1.0 away from the nearshore station during winter in the Kaoping Canyon. The ratio was <1.0 for all but stations near the Pearl estuary (H and H1 stations) during both summer and winter in the NSCS, indicating a year-round heterotrophic around the slope and basin of NSCS. However, this ratio was higher in winter than in summer in the NSCS, possibly resulted from higher GP in winter than in summer. The IGP/IDCR may not be the sole factor in determining the air-sea fluxes of CO2. The physical forcing such as temperature and wind velocity may be also important in determining the source or sink of CO2 in the study areas. Advisors/Committee Members: Jason Yu (chair), James T. Liu (chair), Jia-jang Hung (committee member), Yu-chia Chung (chair).

Subjects/Keywords: bacterial respiration; dark community respiration; organic carbon; gross production

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APA (6^th Edition):

Wang, Y. (2005). Spatial and temporal variability of organic carbon metabolism in Kaoping Coastal Sea and northern South China Sea. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0804105-204017

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Wang, Yu-chieh. “Spatial and temporal variability of organic carbon metabolism in Kaoping Coastal Sea and northern South China Sea.” 2005. Thesis, NSYSU. Accessed December 13, 2019. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0804105-204017.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Wang, Yu-chieh. “Spatial and temporal variability of organic carbon metabolism in Kaoping Coastal Sea and northern South China Sea.” 2005. Web. 13 Dec 2019.

Vancouver:

Wang Y. Spatial and temporal variability of organic carbon metabolism in Kaoping Coastal Sea and northern South China Sea. [Internet] [Thesis]. NSYSU; 2005. [cited 2019 Dec 13]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0804105-204017.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Wang Y. Spatial and temporal variability of organic carbon metabolism in Kaoping Coastal Sea and northern South China Sea. [Thesis]. NSYSU; 2005. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0804105-204017

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Adelaide

3. Chowdhury, Nasrin. Soil microbial activity and community structure as affected by osmotic and matric potential.

Degree: 2011, University of Adelaide

URL: http://hdl.handle.net/2440/69466

► Salinization of soils is a serious land degradation problem, causing poor plant growth and low microbial activity due to osmotic stress, ion toxicity and imbalanced… (more)

▼ Salinization of soils is a serious land degradation problem, causing poor plant growth and low microbial activity due to osmotic stress, ion toxicity and imbalanced element uptake. In arid, semi arid or seasonally arid (Mediterranean) regions, low or fluctuating matric potential causes further stress to soil microorganisms in saline soil by decreasing the osmotic potential as salts in the soil solution become more concentrated, as well as by reducing diffusion and thus substrate availability. Soil properties such as soil texture, water retention characteristics and organic matter content also influence soil microbial activity and community structure and the effect of salinity and matric potential on soil microorganisms. While the effects of low matric and low osmotic potential on soil microorganisms have been studied separately, little is known about their interaction. The objective of this thesis was to determine the interaction between soil matric and osmotic potential on soil microbial activity and community structure. Most experiments described in this thesis were carried out with two non-saline soils (sand and sandy loam) differing in nutrient status, microbial biomass and community composition. Osmotic stress was induced by application of different rates of NaCl. In all experiments, pea residues were added to increase substrate availability and thus microbial activity. Respiration was measured throughout the experimental period (usually 14 days); microbial community structure was measured by phospholipid fatty acid (PLFA) analysis and PLFA patterns were compared by multivariate analysis. The soils were air-dried after collection and an experiment was carried out to determine how quickly microbial activity stabilises after rewetting. Respiration rates in three non-saline and four saline soils stabilised seven to ten days after rewetting of the air dry soil. Therefore the soils used in this study were pre-incubated for 10 days before the experiments were started. To investigate the effect of adaptation to matric and osmotic stress, the sandy loam was incubated for 14 days at different matric or osmotic potential (adaptation) or at optimal water content (no adaptation). Then matric and osmotic potential were adjusted in the treatments with no adaptation, whereas the potentials were maintained in the adapted treatments. Cumulative respiration after 14 days decreased with decreasing osmotic or matric potential with no differences between adapted and non-adapted treatments indicating that prior exposure to low matric and osmotic stress does not increase tolerance compared to a sudden decrease in osmotic and matric potential. The study in which the effect of matric and osmotic stress was compared, both soils showed a greater decrease in cumulative respiration at a given water potential (osmotic + matric) due to matric stress compared to osmotic stress. In the sand, a large proportion of the decrease in cumulative respiration at a given water potential may be due to concomitant low osmotic potential, whereas in the… Advisors/Committee Members: Marschner, Petra (advisor), Murray, Robert Stephen (advisor), School of Agriculture, Food and Wine (school).

Subjects/Keywords: drying and rewetting; microbial biomass; microbial community composition; respiration; salinity; soil water potential; water content

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APA (6^th Edition):

Chowdhury, N. (2011). Soil microbial activity and community structure as affected by osmotic and matric potential. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/69466

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Chowdhury, Nasrin. “Soil microbial activity and community structure as affected by osmotic and matric potential.” 2011. Thesis, University of Adelaide. Accessed December 13, 2019. http://hdl.handle.net/2440/69466.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Chowdhury, Nasrin. “Soil microbial activity and community structure as affected by osmotic and matric potential.” 2011. Web. 13 Dec 2019.

Vancouver:

Chowdhury N. Soil microbial activity and community structure as affected by osmotic and matric potential. [Internet] [Thesis]. University of Adelaide; 2011. [cited 2019 Dec 13]. Available from: http://hdl.handle.net/2440/69466.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Chowdhury N. Soil microbial activity and community structure as affected by osmotic and matric potential. [Thesis]. University of Adelaide; 2011. Available from: http://hdl.handle.net/2440/69466

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Swedish University of Agricultural Sciences

4. Hagenbo, Andreas. Ectomycorrhizal fungal mycelial dynamics and its role in forest soil carbon cycling.

Degree: 2017, Swedish University of Agricultural Sciences

URL: http://pub.epsilon.slu.se/14084/

► Most boreal tree species rely on root-associated ectomycorrhizal fungi for nutrient acquisition, in exchange the trees allocate part of their photosynthetically fixed carbon (C) to… (more)

▼ Most boreal tree species rely on root-associated ectomycorrhizal fungi for nutrient acquisition, in exchange the trees allocate part of their photosynthetically fixed carbon (C) to these fungi. This has a feedback on soil C dynamics as mycorrhizal fungi are important in regulating soil C cycling and storage. However, mycorrhizal fungi are often not included in C dynamics models, as mechanistic understanding of their contribution to mycorrhiza-mediated processes are largely lacking. The aim of the work described in this thesis was to address this knowledge gap by studying the contribution of mycorrhizal fungi in regulating soil C fluxes. This was done by quantifying C fluxes associated with the extraradical mycelium (ERM) of mycorrhizal fungi, and examining how the ERM contributes to variations in soil C cycling along a nemoboreal chronosequence of managed Pinus sylvestris forests. Production and turnover of ERM was quantified by determining ERM biomass in sequentially harvested ingrowth mesh bags and by mathematical modelling. Respiration of ERM was measured as CO2 efflux from mesh bags, and carbon use efficiency (CUE) was calculated from ERM production and respiration rates. We assessed soil fungal communities along the chronosequence and investigated correlations between taxonomic composition and enzyme activities. The ERM standing biomass increased despite decreased production along the chronosequence. This contradiction was explained by a drastic decline in biomass turnover, from seven times to one time per year. The CUE decreased with forest age, but increased tenfold from summer (0.019) to autumn (0.200). This seasonal increase in CUE was associated with a decline in gross photosynthetic production, suggesting that variation in photosynthetic C supply regulates seasonal variations in CUE. Relative abundance of ectomycorrhizal taxa increased with forest age, and was dominated by Atheliaceae species in young forests, and by Cortinarius and Russula species in mature forests. Enzyme activities were related to community composition, and seem to be important for maintaining forest productivity, by facilitating organic nutrient mobilisation. This thesis is a first step in parameterizing mycorrhizal mycelial C fluxes to enable explicit inclusion of ERM parameters in forest ecosystem C models.

Subjects/Keywords: carbon cycle; ectomycorrhiizae; ergosterol; fungal morphology; respiration; boreal forests; carbon use efficiency; chronosequence; ectomycorrhiza; ergosterol; extraradical mycelium; fungal biomass; fungal community; fungal necromass; production; respiration; turnover

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APA (6^th Edition):

Hagenbo, A. (2017). Ectomycorrhizal fungal mycelial dynamics and its role in forest soil carbon cycling. (Doctoral Dissertation). Swedish University of Agricultural Sciences. Retrieved from http://pub.epsilon.slu.se/14084/

Chicago Manual of Style (16^th Edition):

Hagenbo, Andreas. “Ectomycorrhizal fungal mycelial dynamics and its role in forest soil carbon cycling.” 2017. Doctoral Dissertation, Swedish University of Agricultural Sciences. Accessed December 13, 2019. http://pub.epsilon.slu.se/14084/.

MLA Handbook (7^th Edition):

Hagenbo, Andreas. “Ectomycorrhizal fungal mycelial dynamics and its role in forest soil carbon cycling.” 2017. Web. 13 Dec 2019.

Vancouver:

Hagenbo A. Ectomycorrhizal fungal mycelial dynamics and its role in forest soil carbon cycling. [Internet] [Doctoral dissertation]. Swedish University of Agricultural Sciences; 2017. [cited 2019 Dec 13]. Available from: http://pub.epsilon.slu.se/14084/.

Council of Science Editors:

Hagenbo A. Ectomycorrhizal fungal mycelial dynamics and its role in forest soil carbon cycling. [Doctoral Dissertation]. Swedish University of Agricultural Sciences; 2017. Available from: http://pub.epsilon.slu.se/14084/

Université Montpellier II

5. Zamora-Ledezma, Ezequiel. Evidences for an indirect effect of root functional traits and plant composition on soil microbial activities in Mediterranean rangelands : a spatial and temporal approach : Effet indirect des traits fonctionnels et de la composition floristique des activités de la communauté microbienne en prairies méditerranéennes : approche spatiale et temporelle.

Degree: Docteur es, Ecosystèmes et sciences agronomiques, 2013, Université Montpellier II

URL: http://www.theses.fr/2013MON20176

► Il est de plus en plus admis que pour comprendre le fonctionnement des écosystèmes, une approche aérienne associée à une approche souterraine est nécessaire en… (more)

▼ Il est de plus en plus admis que pour comprendre le fonctionnement des écosystèmes, une approche aérienne associée à une approche souterraine est nécessaire en raison des rétroactions entre plantes et sol. La structure des communautés végétales peut affecter le fonctionnement du sol en altérant la quantité et la qualité des ressources intégrant le sol. Les contrôles abiotiques des processus microbiens du sol sont largement documentés, mais les potentiels effets de la composition de la communauté végétale et des traits racinaires sont peu connus. L'étude a été menée sur des prairies méditerranéennes du sud de la France. Nous avons sélectionné 12 communautés contrastées le long d'un gradient de disponibilité des ressources du sol principalement lié à la texture du sol. Les objectifs de cette thèse sont d'évaluer i) la réponse de la composition floristique et des traits foliaires et racinaires mesurés au niveau de la communauté le long gradient édaphique et à travers les saisons, et ii) leurs effets sur trois processus microbiens du sol impliqués dans les cycles du carbone (C) et de l'azote (N) : la respiration potentielle (SIR), la nitrification (NEA) et la dénitrification (DEA). Dans les sols sableux (parcelles peu productives), la communauté végétale possède une stratégie de conservation au niveau des feuilles et une stratégie d'acquisition des ressources au niveau des racines suggérant une forte plasticité des traits racinaires en réponse à la limitation des ressources ; les taux de SIR et NEA sont élevés. Un patron opposé est observé dans les sols argileux des milieux productifs. La DEA ne varie pas le long du gradient. Aucun effet de la richesse spécifique, de l'équitabilité ou de la biomasse végétale sur la SIR ou la NEA n'a été trouvé. Cependant, nous avons démontré qu'il y a une forte influence de la composition fonctionnelle des communautés végétales (abondance des graminoïdes), et surtout des traits racinaires. Nos résultats les plus novateurs montrent que la NEA et dans une moindre mesure la SIR sont positivement corrélés à la concentration en N des racines de la communauté et négativement corrélés à leur ratio C/N, tandis que les traits foliaires analogues ont seulement un effet mineur sur les activités microbiennes. Ces résultats suggèrent que la qualité chimique des racines est le principal pilote des activités du sol et que cela est maintenu à travers les saisons. D'importantes variations saisonnières de la composition floristique des communautés, de leurs traits racinaires et des activités microbiennes, excepté la DEA, ont été mises en avant. Les variations saisonnières des traits racinaires sont interprétées comme un changement relatif de la proportion de racines jeunes/vieilles et suggèrent une asynchronie entre la croissance aérienne et souterraine. Pour la première fois, nous montrons qu'en conditions naturelles, les changements saisonniers des traits fonctionnels racinaires peuvent être impliqués dans le pilotage de la NEA et de la SIR. Ce résultat démontre la nécessité d'études plus approfondies… Advisors/Committee Members: Garnier, Éric (thesis director), Roumet, Catherine (thesis director).

Subjects/Keywords: Respiration du sol; Nitrification; Dénitrification; Communauté végétale; Traits fonctionnels racinaires; Fonctionnement du sol; Soil respiration; Nitrification; Denitrification; Plant community; Root functional traits; Soil functioning

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Zamora-Ledezma, E. (2013). Evidences for an indirect effect of root functional traits and plant composition on soil microbial activities in Mediterranean rangelands : a spatial and temporal approach : Effet indirect des traits fonctionnels et de la composition floristique des activités de la communauté microbienne en prairies méditerranéennes : approche spatiale et temporelle. (Doctoral Dissertation). Université Montpellier II. Retrieved from http://www.theses.fr/2013MON20176

Chicago Manual of Style (16^th Edition):

Zamora-Ledezma, Ezequiel. “Evidences for an indirect effect of root functional traits and plant composition on soil microbial activities in Mediterranean rangelands : a spatial and temporal approach : Effet indirect des traits fonctionnels et de la composition floristique des activités de la communauté microbienne en prairies méditerranéennes : approche spatiale et temporelle.” 2013. Doctoral Dissertation, Université Montpellier II. Accessed December 13, 2019. http://www.theses.fr/2013MON20176.

MLA Handbook (7^th Edition):

Zamora-Ledezma, Ezequiel. “Evidences for an indirect effect of root functional traits and plant composition on soil microbial activities in Mediterranean rangelands : a spatial and temporal approach : Effet indirect des traits fonctionnels et de la composition floristique des activités de la communauté microbienne en prairies méditerranéennes : approche spatiale et temporelle.” 2013. Web. 13 Dec 2019.

Vancouver:

Zamora-Ledezma E. Evidences for an indirect effect of root functional traits and plant composition on soil microbial activities in Mediterranean rangelands : a spatial and temporal approach : Effet indirect des traits fonctionnels et de la composition floristique des activités de la communauté microbienne en prairies méditerranéennes : approche spatiale et temporelle. [Internet] [Doctoral dissertation]. Université Montpellier II; 2013. [cited 2019 Dec 13]. Available from: http://www.theses.fr/2013MON20176.

Council of Science Editors:

Zamora-Ledezma E. Evidences for an indirect effect of root functional traits and plant composition on soil microbial activities in Mediterranean rangelands : a spatial and temporal approach : Effet indirect des traits fonctionnels et de la composition floristique des activités de la communauté microbienne en prairies méditerranéennes : approche spatiale et temporelle. [Doctoral Dissertation]. Université Montpellier II; 2013. Available from: http://www.theses.fr/2013MON20176

Laurentian University

6. Narendrula, Ramya. Biochemical and molecular characterization of microbial communities from a metal contaminated and reclaimed region.

Degree: 2017, Laurentian University

URL: https://zone.biblio.laurentian.ca/handle/10219/2739

► Metal contamination in the Greater Sudbury Region (GSR) resulted in severe environmental degradation. Soil liming and tree planting have been the main approaches to restoring… (more)

▼ Metal contamination in the Greater Sudbury Region (GSR) resulted in severe environmental degradation. Soil liming and tree planting have been the main approaches to restoring the damaged ecosystem. The specific objective of the present study was to assess the effects of soil metal contamination and liming on 1) microbial biomass and abundance, 2) bacterial and fungal diversity, and 3) enzymatic activities and soil respiration. Phospholipid fatty acid (PLFA) analysis and 454 pyrosequencing were used to address these research objectives. Total biomasses for bacteria, arbuscular fungi (AM fungi), other fungi and eukaryotes were significantly lower in metal contaminated compared to uncontaminated reference areas. Analysis of bacterial communities revealed Chao1 index values of 232 and 273 for metal contaminated and reference soils, respectively. For fungi, the Chao index values were 23 for metal contaminated and 45 for reference sites. There was a significant increase of total microbial biomass in limed sites (342.15 ng/g) compared to unlimed areas (149.89 ng/g). Chao1 estimates followed the same trend. But the total number of OTUs (Operational Taxonomic Units) in limed (463 OTUs) and unlimed (473 OTUs) soil samples for bacteria were similar. For fungi, OTUs were 96 and 81 for limed and unlimed soil samples, respectively. Bacterial and fungal groups that were specific to either limed or unlimed sites were identified. Bradyrhizobiaceae family with 12 genera including the nitrogen fixing Bradirhizobium genus was more abundant in limed sites compared to unlimed areas. For fungi, Ascomycota was the most predominant phylum in unlimed soils (46.00%) while Basidiomycota phylum represented 85.74% of all fungi in the limed areas. Detailed analysis of the data showed that although soil liming increases significantly the amount of microbial biomass, the level of species diversity remained statistically unchanged. Soil respiration rates were higher in limed soils (65 ppm) compared to unlimed soils (35 ppm). They were significantly lower in metal contaminated sites (55 ppm) compared to reference sites (90 ppm). β-glucosidase (BG), cellobiohydrolase (CBH), β-N-acetylglucosaminidase (NAGase), aryl sulfatase (AS), acid phosphatase (AP), alkaline phosphatase (AlP), glycine aminopeptidase (GAP), and leucine aminopeptidase (LAP) activites were significantly higher in limed compared to unlimed sites. Metal contamination significantly reduced the activities of these enzymes with the exception of LAP. An opposite trend was observed for peroxidase (PER) enzyme activity that was higher in unlimed and metal contaminated sites compared to limed and reference areas.

Subjects/Keywords: Metals; Soil pH; CEC; PLFA Analysis; Pyrosequencing; Bacterial and fungal community; Soil microbial diversity and abundance; Soil respiration; Microbial activity

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APA (6^th Edition):

Narendrula, R. (2017). Biochemical and molecular characterization of microbial communities from a metal contaminated and reclaimed region. (Thesis). Laurentian University. Retrieved from https://zone.biblio.laurentian.ca/handle/10219/2739

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Narendrula, Ramya. “Biochemical and molecular characterization of microbial communities from a metal contaminated and reclaimed region. ” 2017. Thesis, Laurentian University. Accessed December 13, 2019. https://zone.biblio.laurentian.ca/handle/10219/2739.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Narendrula, Ramya. “Biochemical and molecular characterization of microbial communities from a metal contaminated and reclaimed region. ” 2017. Web. 13 Dec 2019.

Vancouver:

Narendrula R. Biochemical and molecular characterization of microbial communities from a metal contaminated and reclaimed region. [Internet] [Thesis]. Laurentian University; 2017. [cited 2019 Dec 13]. Available from: https://zone.biblio.laurentian.ca/handle/10219/2739.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Narendrula R. Biochemical and molecular characterization of microbial communities from a metal contaminated and reclaimed region. [Thesis]. Laurentian University; 2017. Available from: https://zone.biblio.laurentian.ca/handle/10219/2739

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Western Australia

7. Luitingh, Taryn Leigh. Adaptation of the microbial decomposer community to the burial of skeletal muscle tissue in contrasting soils.

Degree: M.For.Sc., 2008, University of Western Australia

URL: http://repository.uwa.edu.au:80/R/?func=dbin-jump-full&object_id=5889&local_base=GEN01-INS01

►

Microorganisms are known to be agents involved in the decomposition of organic matter. However, little is known about the participation of the microbial communities during… (more)

▼

Microorganisms are known to be agents involved in the decomposition of organic matter. However, little is known about the participation of the microbial communities during the decomposition of mammalian skeletal muscle tissue. This study investigates the capacity of the soil microbial community to adapt to the decomposition of skeletal muscle tissue in differing soils. This has implications for the study of mass graves and sites of repeated burial. A controlled laboratory experiment was designed to assess the adaptability of microbial communities present in three distinct soil types (sand, loamy sand and sandy clay loam) found near Perth, Western Australia. This experiment was split into two main stages. The initial decomposition stage involved the addition of porcine skeletal muscle tissue (SMT) (Sus scrofa) to each of the three soil types which were then left to decompose for a period of time. Controls were run in parallel, which had no porcine SMT present. The second decomposition stage involved a second addition of SMT to the soils obtained from the initial decomposition stage. Therefore, for each soil, SMT was either decomposed in the soil that had been pre-exposed to SMT or not. The rate of decomposition, microbial activity (CO2 respiration) and microbial biomass (substrate-induced respiration) were monitored during the second decomposition stage. The functional diversity of the microbial populations in the soil were assessed using Community-Level Physiological Profiling (CLPP). Across the three soil types, the re-introduction of SMT to the soil has led to its enhanced decomposition (measured by tissue mass loss and microbial activity) by the microbial communities. This microbial adaptation may have been facilitated by a functional change in the soil microbial communities.

Microorganisms are known to be agents involved in the decomposition of organic matter. However, little is known about the participation of the microbial communities during the decomposition of mammalian skeletal muscle tissue. This study investigates the capacity of the soil microbial community to adapt to the decomposition of skeletal muscle tissue in differing soils. This has implications for the study of mass graves and sites of repeated burial. A controlled laboratory experiment was designed to assess the adaptability of microbial communities present in three distinct soil types (sand, loamy sand and sandy clay loam) found near Perth, Western Australia. This experiment was split into two main stages. The initial decomposition stage involved the addition of porcine skeletal muscle tissue (SMT) (Sus scrofa) to each of the three soil types which were then left to decompose for a period of time. Controls were run in parallel, which had no porcine SMT present. The second decomposition stage involved a second addition of SMT to the soils obtained from the initial decomposition stage. Therefore, for each soil, SMT was either decomposed in the soil that had been pre-exposed to SMT or not. The rate of decomposition, microbial activity (CO2…

Subjects/Keywords: Forensic taphonomy; Human decomposition; Microorganisms; Soil microbiology; Soils; Forensic taphonomy; CO₂ respiration; CLPP; Microbial community; Microbial decomposition; Microbial adaptation

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APA (6^th Edition):

Luitingh, T. L. (2008). Adaptation of the microbial decomposer community to the burial of skeletal muscle tissue in contrasting soils. (Masters Thesis). University of Western Australia. Retrieved from http://repository.uwa.edu.au:80/R/?func=dbin-jump-full&object_id=5889&local_base=GEN01-INS01

Chicago Manual of Style (16^th Edition):

Luitingh, Taryn Leigh. “Adaptation of the microbial decomposer community to the burial of skeletal muscle tissue in contrasting soils.” 2008. Masters Thesis, University of Western Australia. Accessed December 13, 2019. http://repository.uwa.edu.au:80/R/?func=dbin-jump-full&object_id=5889&local_base=GEN01-INS01.

MLA Handbook (7^th Edition):

Luitingh, Taryn Leigh. “Adaptation of the microbial decomposer community to the burial of skeletal muscle tissue in contrasting soils.” 2008. Web. 13 Dec 2019.

Vancouver:

Luitingh TL. Adaptation of the microbial decomposer community to the burial of skeletal muscle tissue in contrasting soils. [Internet] [Masters thesis]. University of Western Australia; 2008. [cited 2019 Dec 13]. Available from: http://repository.uwa.edu.au:80/R/?func=dbin-jump-full&object_id=5889&local_base=GEN01-INS01.

Council of Science Editors:

Luitingh TL. Adaptation of the microbial decomposer community to the burial of skeletal muscle tissue in contrasting soils. [Masters Thesis]. University of Western Australia; 2008. Available from: http://repository.uwa.edu.au:80/R/?func=dbin-jump-full&object_id=5889&local_base=GEN01-INS01

University of Western Ontario

8. Irwin, Craig. Spatio-temporal Variation of Benthic Metabolism in a Large Regulated River.

Degree: 2017, University of Western Ontario

URL: https://ir.lib.uwo.ca/etd/5004

► Spatio-temporal patterns of benthic metabolism were measured to determine associations with substrate (cobble vs sand), channel location (main vs side channel), flow regulation (medium-head vs… (more)

Subjects/Keywords: benthic metabolism; large river; Saint John River; spatio-temporal variation; gross primary production; community respiration; Environmental Indicators and Impact Assessment

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APA (6^th Edition):

Irwin, C. (2017). Spatio-temporal Variation of Benthic Metabolism in a Large Regulated River. (Thesis). University of Western Ontario. Retrieved from https://ir.lib.uwo.ca/etd/5004

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Irwin, Craig. “Spatio-temporal Variation of Benthic Metabolism in a Large Regulated River.” 2017. Thesis, University of Western Ontario. Accessed December 13, 2019. https://ir.lib.uwo.ca/etd/5004.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Irwin, Craig. “Spatio-temporal Variation of Benthic Metabolism in a Large Regulated River.” 2017. Web. 13 Dec 2019.

Vancouver:

Irwin C. Spatio-temporal Variation of Benthic Metabolism in a Large Regulated River. [Internet] [Thesis]. University of Western Ontario; 2017. [cited 2019 Dec 13]. Available from: https://ir.lib.uwo.ca/etd/5004.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Irwin C. Spatio-temporal Variation of Benthic Metabolism in a Large Regulated River. [Thesis]. University of Western Ontario; 2017. Available from: https://ir.lib.uwo.ca/etd/5004

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Plymouth

9. Calder-Potts, Ruth Naomi. The biological and ecological impacts of hypoxia on coastal benthic communities.

Degree: PhD, 2017, University of Plymouth

URL: http://hdl.handle.net/10026.1/9352

► Traditionally, hypoxia has been defined as the situation where DO levels have fallen below 2.0 mg O2 L-1, but increasing evidence suggests that this low… (more)

▼ Traditionally, hypoxia has been defined as the situation where DO levels have fallen below 2.0 mg O2 L-1, but increasing evidence suggests that this low level of DO is inadequate to describe the onset of hypoxia impacts for many organisms. Consequently, there is a need for a greater understanding of how ‘moderate’ alterations in DO levels will affect ecosystem processes and functionality, specifically through behavioural and physiological alterations at the organism and community level. This thesis reports on mesocosm experiments which were conducted to examine the effects of moderate ( > 3.0 mg O2 L-1) hypoxia on firstly, a key ecosystem engineer, the brittlestar Amphiura filiformis, and secondly, on the Station L4 infaunal macrobenthic community. Station L4 is a longstanding marine biodiversity and MSFD reference site and forms part of the Western Channel Observatory. At the organism level, short-term (14 d) exposure to moderate hypoxia significantly reduced oxygen uptake rates, oocyte diameter and oocyte development in A. filiformis. However, these physiological affects occurred irrespective of brittlestar population density. Additionally, moderate hypoxia reduced brittlestar activity, in terms of bioturbation behaviour, consequentially having an effect on ammonium and silicate fluxes. These observations were only detected when brittlestar population density was high. It was concluded that denser populations of A. filiformis may therefore exhibit the greatest changes in behaviour and shifts in ecosystem function as competition for resources and oxygen heightens. The benthic community at Station L4, displayed considerable tolerance to medium-term (6 wk.) exposure to moderate hypoxia, in terms of structure, diversity and bioturbatory behaviour, but these results may be different if exposure was longer or more severe. Alterations in nutrient fluxes were detected, but there was little evidence to suggest these changes were due to macrofaunal behavioural alterations. Additionally, results from this study revealed that bringing complex natural communities into the mesocosm caused a substantial loss of individuals and species, mainly due to translocation and disturbance effects. This important insight into the effects of bringing community assemblages into the mesocosm confirms that even with a loss of diversity, the L4 community maintained functionality and was resilient to alterations in DO. This suggests that the L4 benthic community does not depend on any one specific species for the provision of important ecosystem processes, resulting in considerable functional resilience within the L4 system. However, vulnerability to benthic systems may increase if functionality is dominated by species such as A. filiformis. Consequently, moderate hypoxia may not immediately affect benthic communities in terms of structure and diversity, but the physiological effects on individuals, especially to reproductive development, may cause alterations in the quality and quantity of planktonic propagules supplied by benthic species to the…

Subjects/Keywords: 578.77; hypoxia; low oxygen; bioturbation; invertebrate ecology; community response; global change; invertebrate biology; aerobic respiration; ecosystem processes

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APA (6^th Edition):

Calder-Potts, R. N. (2017). The biological and ecological impacts of hypoxia on coastal benthic communities. (Doctoral Dissertation). University of Plymouth. Retrieved from http://hdl.handle.net/10026.1/9352

Chicago Manual of Style (16^th Edition):

Calder-Potts, Ruth Naomi. “The biological and ecological impacts of hypoxia on coastal benthic communities.” 2017. Doctoral Dissertation, University of Plymouth. Accessed December 13, 2019. http://hdl.handle.net/10026.1/9352.

MLA Handbook (7^th Edition):

Calder-Potts, Ruth Naomi. “The biological and ecological impacts of hypoxia on coastal benthic communities.” 2017. Web. 13 Dec 2019.

Vancouver:

Calder-Potts RN. The biological and ecological impacts of hypoxia on coastal benthic communities. [Internet] [Doctoral dissertation]. University of Plymouth; 2017. [cited 2019 Dec 13]. Available from: http://hdl.handle.net/10026.1/9352.

Council of Science Editors:

Calder-Potts RN. The biological and ecological impacts of hypoxia on coastal benthic communities. [Doctoral Dissertation]. University of Plymouth; 2017. Available from: http://hdl.handle.net/10026.1/9352

University of Notre Dame

10. Timothy J Hoellein. The effects of seasonality and restoration on stream nutrient cycling at multiple spatial scales</h1>.

Degree: PhD, Biological Sciences, 2008, University of Notre Dame

URL: https://curate.nd.edu/show/n009w091c69

► Human activities have increased concentrations of nutrients including nitrogen (N) and phosphorus (P) in freshwater ecosystems worldwide. Understanding how excess nutrients are processed is… (more)

▼ Human activities have increased concentrations of nutrients including nitrogen (N) and phosphorus (P) in freshwater ecosystems worldwide. Understanding how excess nutrients are processed is critical for public and ecological health. Headwater streams are important sites of nutrient transformation, but little is known about how temporal variation (e.g., seasonal change) and stream restoration strategies influence rates of nutrient cycling. My dissertation focuses on how seasonality and restoration, alone and in combination, control nutrient uptake rates at the whole-stream and substratum-specific scales in 3 headwater streams in the Upper Peninsula of Michigan. By measuring whole-stream and substratum-specific rates of nutrient uptake across seasons, I found that although heterotrophic processes typically dominate in forested headwater streams, variation in nutrient uptake was also explained by autotrophic activity. My results suggested changes in streambed substrata composition strongly influences seasonal patterns of nutrient processing at the whole-stream scale. These conclusions are significant in the context of restoration, which often results in changes to the streambed “landscape” I also used seasonal measurements of nutrient uptake to document the influence of two contrasting restoration strategies on stream ecosystem function. For a trout habitat enhancement, I found that physical changes in stream habitat translated into few biological effects on uptake rates and fish communities, and concluded it may not represent a sustainable method for increasing trout abundance. For a wood addition study, I found increased nutrient uptake following intermediate disturbance (e.g. storms), contrasting with significant decreases in uptake following large storms. Therefore, the effect of wood addition on ecosystem function was variable across a disturbance gradient, and should be considered in future restoration. My dissertation research demonstrates that nutrient uptake in headwater streams is seasonally dynamic, with significant stream-specific variability, all of which is linked to differences in streambed substrata composition. Changes to stream ecosystems such as those resulting from restoration can influence seasonal patterns of nutrient processing, altering the timing of nutrient delivery to downstream ecosystems. Overall, nutrient uptake rates are sensitive metrics for integrating changes in stream biological activity, and represent a powerful tool for characterizing the influence of seasonal change and restoration on stream ecosystem function. Advisors/Committee Members: Gary Lamberti, Committee Member, Jennifer Tank, Committee Chair, Ronald Hellenthal, Committee Member, Emma Rosi-Marshall, Committee Member.

Subjects/Keywords: nutrient uptake; community respiration; restoration; stream; primary production; biofilms

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APA (6^th Edition):

Hoellein, T. J. (2008). The effects of seasonality and restoration on stream nutrient cycling at multiple spatial scales</h1>. (Doctoral Dissertation). University of Notre Dame. Retrieved from https://curate.nd.edu/show/n009w091c69

Chicago Manual of Style (16^th Edition):

Hoellein, Timothy J. “The effects of seasonality and restoration on stream nutrient cycling at multiple spatial scales</h1>.” 2008. Doctoral Dissertation, University of Notre Dame. Accessed December 13, 2019. https://curate.nd.edu/show/n009w091c69.

MLA Handbook (7^th Edition):

Hoellein, Timothy J. “The effects of seasonality and restoration on stream nutrient cycling at multiple spatial scales</h1>.” 2008. Web. 13 Dec 2019.

Vancouver:

Hoellein TJ. The effects of seasonality and restoration on stream nutrient cycling at multiple spatial scales</h1>. [Internet] [Doctoral dissertation]. University of Notre Dame; 2008. [cited 2019 Dec 13]. Available from: https://curate.nd.edu/show/n009w091c69.

Council of Science Editors:

Hoellein TJ. The effects of seasonality and restoration on stream nutrient cycling at multiple spatial scales</h1>. [Doctoral Dissertation]. University of Notre Dame; 2008. Available from: https://curate.nd.edu/show/n009w091c69

University of Adelaide

11. Umar, Shariah. Effect of clay on plant residue decomposition.

Degree: 2010, University of Adelaide

URL: http://hdl.handle.net/2440/60392

► Plant residues added to soil are a source of nutrients for plants and soil organisms and increase soil organic matter which has an important role… (more)

▼ Plant residues added to soil are a source of nutrients for plants and soil organisms and increase soil organic matter which has an important role in improving soil structure and fertility, hence maintaining soil quality for sustainable agriculture. In order to utilize plant residues for increasing soil organic matter more effectively, it is necessary to understand the mechanisms of plant residue decomposition. Soil organic matter decomposition is influenced by several factors such as plant residue quality, temperature, water availability, soil structure and soil texture, particularly clay content. The interaction of clay and decomposition of organic matter has been studied in the past. Nevertheless, many studies investigated this interaction in natural soil or under field conditions over long periods of time. Variation in environmental factors may influence the interaction of clay and decomposition of organic matter, thus in most previous studies their effect cannot be separated from the direct effect of clay on decomposition. To study the direct effect of clay on organic matter decomposition, four experiments with different objectives were carried out using isolated natural clay, under controlled conditions (e.g. temperature and organic matter input) and a short incubation period (approximately one month). All experiments were carried out using a sand matrix to which different clay types, clay fractions (natural or with iron oxide partially removed) or clay concentrations were added together with mature wheat straw (C/N 122 in most experiments, except Experiment 2 where the wheat straw had a C/N of 18) and a microbial inoculum. To investigate the effect of clay type, two clay types were added. They were isolated from Wiesenboden (W) and Red Brown Earth (RBE) soil. Clay types from both soils contained kaolinite and illite, but smectite only occurred in W clay. Iron oxide is thought to be important for the binding of organic matter to clay, therefore two clay fractions were used, the clay with native iron oxide (natural clay) and clay from which iron oxide was partially removed by citrate-dithionite-bicarbonate treatment (citrate-dithionite clay, CD clay). The following parameters were measured: pH, water loss, respiration rate, microbial community structure using phospholipid fatty acid analysis and, in some experiments, particulate organic matter. In all experiments, the water content of the substrate mixes was adjusted only at the start; water loss was greatest in the control and decreased with increasing clay content. The aim of the first experiment was to study the effect of the concentration of W clay on decomposition of wheat residues. Respiration (i.e. decomposition of the wheat straw) was affected by clay in two ways (i) decreased decomposition, thus protection of organic matter, in the initial phase at all concentrations (5, 10, 20 and 40%) and throughout the incubation period at ≤ 20% clay, and (ii) greater water retention at higher clay concentration particularly 40% clay that allowed maintenance of… Advisors/Committee Members: Marschner, Petra (advisor), Baumann, Karen (advisor), Churchman, Gordon (advisor), School of Earth and Environmental Sciences : Soil and Land Systems (school).

Subjects/Keywords: plant residue decomposition; clay; iron oxides; respiration; microbial biomass; microbial community structure; particulate organic matter; Plant litter Biodegradation.; Clay

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APA (6^th Edition):

Umar, S. (2010). Effect of clay on plant residue decomposition. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/60392

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Umar, Shariah. “Effect of clay on plant residue decomposition.” 2010. Thesis, University of Adelaide. Accessed December 13, 2019. http://hdl.handle.net/2440/60392.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Umar, Shariah. “Effect of clay on plant residue decomposition.” 2010. Web. 13 Dec 2019.

Vancouver:

Umar S. Effect of clay on plant residue decomposition. [Internet] [Thesis]. University of Adelaide; 2010. [cited 2019 Dec 13]. Available from: http://hdl.handle.net/2440/60392.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Umar S. Effect of clay on plant residue decomposition. [Thesis]. University of Adelaide; 2010. Available from: http://hdl.handle.net/2440/60392

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Laurentian University

12. Narendrula, Ramya. Biochemical and molecular characterization of microbial communities from a metal contaminated and reclaimed region.

Degree: 2017, Laurentian University

URL: https://zone.biblio.laurentian.ca/handle/10219/2739

► Metal contamination in the Greater Sudbury Region (GSR) resulted in severe environmental degradation. Soil liming and tree planting have been the main approaches to restoring… (more)

▼ Metal contamination in the Greater Sudbury Region (GSR) resulted in severe environmental degradation. Soil liming and tree planting have been the main approaches to restoring the damaged ecosystem. The specific objective of the present study was to assess the effects of soil metal contamination and liming on 1) microbial biomass and abundance, 2) bacterial and fungal diversity, and 3) enzymatic activities and soil respiration. Phospholipid fatty acid (PLFA) analysis and 454 pyrosequencing were used to address these research objectives. Total biomasses for bacteria, arbuscular fungi (AM fungi), other fungi and eukaryotes were significantly lower in metal contaminated compared to uncontaminated reference areas. Analysis of bacterial communities revealed Chao1 index values of 232 and 273 for metal contaminated and reference soils, respectively. For fungi, the Chao index values were 23 for metal contaminated and 45 for reference sites. There was a significant increase of total microbial biomass in limed sites (342.15 ng/g) compared to unlimed areas (149.89 ng/g). Chao1 estimates followed the same trend. But the total number of OTUs (Operational Taxonomic Units) in limed (463 OTUs) and unlimed (473 OTUs) soil samples for bacteria were similar. For fungi, OTUs were 96 and 81 for limed and unlimed soil samples, respectively. Bacterial and fungal groups that were specific to either limed or unlimed sites were identified. Bradyrhizobiaceae family with 12 genera including the nitrogen fixing Bradirhizobium genus was more abundant in limed sites compared to unlimed areas. For fungi, Ascomycota was the most predominant phylum in unlimed soils (46.00%) while Basidiomycota phylum represented 85.74% of all fungi in the limed areas. Detailed analysis of the data showed that although soil liming increases significantly the amount of microbial biomass, the level of species diversity remained statistically unchanged. Soil respiration rates were higher in limed soils (65 ppm) compared to unlimed soils (35 ppm). They were significantly lower in metal contaminated sites (55 ppm) compared to reference sites (90 ppm). β-glucosidase (BG), cellobiohydrolase (CBH), β-N-acetylglucosaminidase (NAGase), aryl sulfatase (AS), acid phosphatase (AP), alkaline phosphatase (AlP), glycine aminopeptidase (GAP), and leucine aminopeptidase (LAP) activites were significantly higher in limed compared to unlimed sites. Metal contamination significantly reduced the activities of these enzymes with the exception of LAP. An opposite trend was observed for peroxidase (PER) enzyme activity that was higher in unlimed and metal contaminated sites compared to limed and reference areas.

Subjects/Keywords: Metals; Soil pH; CEC; PLFA Analysis; Pyrosequencing; Bacterial and fungal community; Soil microbial diversity and abundance; Soil respiration; Microbial activity

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APA (6^th Edition):

Narendrula, R. (2017). Biochemical and molecular characterization of microbial communities from a metal contaminated and reclaimed region. (Thesis). Laurentian University. Retrieved from https://zone.biblio.laurentian.ca/handle/10219/2739

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Narendrula, Ramya. “Biochemical and molecular characterization of microbial communities from a metal contaminated and reclaimed region. ” 2017. Thesis, Laurentian University. Accessed December 13, 2019. https://zone.biblio.laurentian.ca/handle/10219/2739.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Narendrula, Ramya. “Biochemical and molecular characterization of microbial communities from a metal contaminated and reclaimed region. ” 2017. Web. 13 Dec 2019.

Vancouver:

Narendrula R. Biochemical and molecular characterization of microbial communities from a metal contaminated and reclaimed region. [Internet] [Thesis]. Laurentian University; 2017. [cited 2019 Dec 13]. Available from: https://zone.biblio.laurentian.ca/handle/10219/2739.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Narendrula R. Biochemical and molecular characterization of microbial communities from a metal contaminated and reclaimed region. [Thesis]. Laurentian University; 2017. Available from: https://zone.biblio.laurentian.ca/handle/10219/2739

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Cape Town

13. Dalvie, Mohamed Aqiel. The long-term respiratory health effects of the herbicide, paraquat, among Western Cape workers.

Degree: Image, Medicine, 1996, University of Cape Town

URL: http://hdl.handle.net/11427/25687

► Objective: Paraquat is a commonly used herbicide worldwide and is a well-documented cause of pulmonary fibrosis in studies of laboratory animals and in humans following… (more)

Subjects/Keywords: Occupational Health~Paraquat - adverse effects~Paraquat - toxicity~Respiration disorders - etiology; Community Health

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APA (6^th Edition):

Dalvie, M. A. (1996). The long-term respiratory health effects of the herbicide, paraquat, among Western Cape workers. (Thesis). University of Cape Town. Retrieved from http://hdl.handle.net/11427/25687

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Dalvie, Mohamed Aqiel. “The long-term respiratory health effects of the herbicide, paraquat, among Western Cape workers.” 1996. Thesis, University of Cape Town. Accessed December 13, 2019. http://hdl.handle.net/11427/25687.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Dalvie, Mohamed Aqiel. “The long-term respiratory health effects of the herbicide, paraquat, among Western Cape workers.” 1996. Web. 13 Dec 2019.

Vancouver:

Dalvie MA. The long-term respiratory health effects of the herbicide, paraquat, among Western Cape workers. [Internet] [Thesis]. University of Cape Town; 1996. [cited 2019 Dec 13]. Available from: http://hdl.handle.net/11427/25687.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Dalvie MA. The long-term respiratory health effects of the herbicide, paraquat, among Western Cape workers. [Thesis]. University of Cape Town; 1996. Available from: http://hdl.handle.net/11427/25687

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Waterloo

14. Venkiteswaran, Jason James. Greenhouse gas cycling in experimental boreal reservoirs.

Degree: 2009, University of Waterloo

URL: http://hdl.handle.net/10012/4168

► Hydroelectric reservoirs account for 59% of the installed electricity generating capacity in Canada and 26% in Ontario. Reservoirs also provide irrigation capacity, drinking water, and… (more)

▼ Hydroelectric reservoirs account for 59% of the installed electricity generating capacity in Canada and 26% in Ontario. Reservoirs also provide irrigation capacity, drinking water, and recreational opportunities. Further, they continue to be built in northern Canada, neighbouring boreal countries, and around the world. Yet given their socio-economic importance, they are understudied with respect to greenhouse gas emissions, nutrient and mercury cycling, and aquatic metabolism. As one of many electricity generating options, hydroelectricity is viewed as well-tested because of its long history and diverse applications in mega-projects, run-of-the-river dams, and small, local applications. It is also considered renewable from a fuel stand-point because an adequate long-term supply of water is assumed. One of several significant criticisms of hydroelectric development is that reservoirs may be a significant source of greenhouse gases to the atmosphere relative to the amount of electricity produced due to flooding the landscape. As a result of the dearth of information on reservoir development and both greenhouse gases and aquatic metabolism, a pair of whole-ecosystem reservoir experiments were conducted staring in 1991. Three upland boreal forest reservoirs with differing amounts of pre-flood stored organic carbon were built in northwestern Ontario and flooded for five years. The rates of net greenhouse gas production in these reservoirs were determined by calculating mass budgets for carbon dioxide and methane. Additionally, rates of biological processes were determined by combining the mass budgets with measurements of the stable isotopes of carbon and oxygen. Assembling mass and isotope-mass budgets required three related projects on gas exchange, methane oxidation, and oxygen isotopes. To estimate the gas exchange coefficient for each of the upland reservoirs, a comparative-methods study was undertaken. Methane oxidation enrichment factors were determined in upland and wetland boreal reservoirs so that the importance of methane oxidation in these ecosystems could be assessed. In order to interpret the diel changes in both oxygen concentrations and their isotopic ratios, a dynamic model was developed. This model, PoRGy, was successfully applied to the upland boreal reservoirs as well as prairie rivers and ponds. Further, PoRGy was used to understand the interplay between the key parameters that control oxygen concentrations, to compare aquatic ecosystems, to make quantitative estimates of ecosystem metabolism, and to assess the vulnerability of aquatic ecosystems under various environmental stressors. Carbon isotope-mass budgets were used to conclude that community respiration rates declined quickly in the upland reservoirs and had declined by half over five years. This suggested that the most labile organic carbon is quickly consumed but decomposition continued for the five-year life of the project. Net primary production rates were similar for three years, with a small peak in the second or third year,…

Subjects/Keywords: hydroelectric reservoirs; stable isotopes; community respiration; primary production; whole-ecosystem experiment; catchment-scale

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APA (6^th Edition):

Venkiteswaran, J. J. (2009). Greenhouse gas cycling in experimental boreal reservoirs. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/4168

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Venkiteswaran, Jason James. “Greenhouse gas cycling in experimental boreal reservoirs.” 2009. Thesis, University of Waterloo. Accessed December 13, 2019. http://hdl.handle.net/10012/4168.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Venkiteswaran, Jason James. “Greenhouse gas cycling in experimental boreal reservoirs.” 2009. Web. 13 Dec 2019.

Vancouver:

Venkiteswaran JJ. Greenhouse gas cycling in experimental boreal reservoirs. [Internet] [Thesis]. University of Waterloo; 2009. [cited 2019 Dec 13]. Available from: http://hdl.handle.net/10012/4168.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Venkiteswaran JJ. Greenhouse gas cycling in experimental boreal reservoirs. [Thesis]. University of Waterloo; 2009. Available from: http://hdl.handle.net/10012/4168

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Lund

15. Rath, Kristin. Soil salinity as a driver of microbial community structure and functioning.

Degree: 2017, University of Lund

URL: http://lup.lub.lu.se/record/b3a38a3e-9073-4475-ab6e-efd1f0eb6f42 ; http://portal.research.lu.se/ws/files/35616924/thesis_Dec12.pdf

► Soil salinization is a pressing agricultural problem in many areas of the world, particularly in areas heavily reliant on irrigation agriculture. While the negative effects… (more)

▼ Soil salinization is a pressing agricultural problem in many areas of the world, particularly in areas heavily reliant on irrigation agriculture. While the negative effects of salinity on crop plants have been widely studied, its effects on soil microorganisms have received less attention, and the impact of soil salinity on both microbial community structure and functioning is not well understood. Soil microorganisms are important in regulating terrestrial biogeochemical processes and changes in microbial community structure and functioning in response to salinization could have far-reaching consequences for carbon and nutrient cycling. The main aims of this thesis were to (a) assess and compare the impact of salinity on different microbial processes in soil, (b) study the ability of soil microbial communities to adapt to increasing salinity and connect increased tolerance to changes in community composition and functioning, and (c) study the combined impact of salinity and another important environmental disturbance, drought. The impact of salinity on soil microorganisms was studied at three different time scales: (i) acute salt exposure, (ii) exposure over one month and (iii) naturally saline soils having experienced high salt concentrations over long time periods. I found that processes such as growth, respiration and N transformation rates were strongly negatively reduced in response to acute salt exposure. However, increased salt tolerance of the microbial community could be induced quickly, combined with a partial recovery of process rates. A strong relationship between soil salinity and community salt tolerance was also found along natural gradients of salinity. Higher community salt tolerance was reflected in shifts in the composition of the bacterial community. Fungi were less sensitive to salt exposure than bacteria, which manifested in less inhibition of fungal growth both after short-term and long-term exposure to salinity. When salinity was combined with drying of soils, the effects of the individual factors were exacerbated. Increased soil salinity also modified the microbial response to rewetting of died soil.In summary, soil salinity was found to be an important regulator of both microbial functioning and community composition. While microbial communities have a strong potential to adapt to increasing salt concentrations which can offset to some defree the loss of functioning of the microbial community, process rates are still reduced in saline soils compared to non-saline soils. Thus, as salt-affected soils increase in area, the ability of microorganisms in saline soils to sustain biogeochemical cycles need to be considered.

Subjects/Keywords: Miljövetenskap; Soil salinization; Soil Microbiology; soil microbial community; Bacteria, Aerobic; Fungi; Drying-rewetting; Microbial growth; Microbial biomass; Soil respiration; salinity tolerance; Saline soils; Salinity gradient

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APA (6^th Edition):

Rath, K. (2017). Soil salinity as a driver of microbial community structure and functioning. (Doctoral Dissertation). University of Lund. Retrieved from http://lup.lub.lu.se/record/b3a38a3e-9073-4475-ab6e-efd1f0eb6f42 ; http://portal.research.lu.se/ws/files/35616924/thesis_Dec12.pdf

Chicago Manual of Style (16^th Edition):

Rath, Kristin. “Soil salinity as a driver of microbial community structure and functioning.” 2017. Doctoral Dissertation, University of Lund. Accessed December 13, 2019. http://lup.lub.lu.se/record/b3a38a3e-9073-4475-ab6e-efd1f0eb6f42 ; http://portal.research.lu.se/ws/files/35616924/thesis_Dec12.pdf.

MLA Handbook (7^th Edition):

Rath, Kristin. “Soil salinity as a driver of microbial community structure and functioning.” 2017. Web. 13 Dec 2019.

Vancouver:

Rath K. Soil salinity as a driver of microbial community structure and functioning. [Internet] [Doctoral dissertation]. University of Lund; 2017. [cited 2019 Dec 13]. Available from: http://lup.lub.lu.se/record/b3a38a3e-9073-4475-ab6e-efd1f0eb6f42 ; http://portal.research.lu.se/ws/files/35616924/thesis_Dec12.pdf.

Council of Science Editors:

Rath K. Soil salinity as a driver of microbial community structure and functioning. [Doctoral Dissertation]. University of Lund; 2017. Available from: http://lup.lub.lu.se/record/b3a38a3e-9073-4475-ab6e-efd1f0eb6f42 ; http://portal.research.lu.se/ws/files/35616924/thesis_Dec12.pdf

SUNY College at Brockport

16. Roarabaugh, Doyle Bryan. The Role of Autochothnous Production in the Formation of Dissolved and Particulate Organics in Laboratory Streams.

Degree: MS, Biological Sciences, 1977, SUNY College at Brockport

URL: https://digitalcommons.brockport.edu/bio_theses/101

► The role of autochthonous production in the formation of dissolved and fine particulate organic carbon (DOC and FPOC) was studied in simplified communities in… (more)

Subjects/Keywords: DOC; FPOC; community respiration; primary production; community structure; Biology; Ecology and Evolutionary Biology; Life Sciences

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APA (6^th Edition):

Roarabaugh, D. B. (1977). The Role of Autochothnous Production in the Formation of Dissolved and Particulate Organics in Laboratory Streams. (Thesis). SUNY College at Brockport. Retrieved from https://digitalcommons.brockport.edu/bio_theses/101

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Roarabaugh, Doyle Bryan. “The Role of Autochothnous Production in the Formation of Dissolved and Particulate Organics in Laboratory Streams.” 1977. Thesis, SUNY College at Brockport. Accessed December 13, 2019. https://digitalcommons.brockport.edu/bio_theses/101.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Roarabaugh, Doyle Bryan. “The Role of Autochothnous Production in the Formation of Dissolved and Particulate Organics in Laboratory Streams.” 1977. Web. 13 Dec 2019.

Vancouver:

Roarabaugh DB. The Role of Autochothnous Production in the Formation of Dissolved and Particulate Organics in Laboratory Streams. [Internet] [Thesis]. SUNY College at Brockport; 1977. [cited 2019 Dec 13]. Available from: https://digitalcommons.brockport.edu/bio_theses/101.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Roarabaugh DB. The Role of Autochothnous Production in the Formation of Dissolved and Particulate Organics in Laboratory Streams. [Thesis]. SUNY College at Brockport; 1977. Available from: https://digitalcommons.brockport.edu/bio_theses/101

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Université de Sherbrooke

17. Jewell, Mark. Diversité des arbres, interactions aériennes et souterraines et décomposition des feuilles mortes .

Degree: 2014, Université de Sherbrooke

URL: http://savoirs.usherbrooke.ca/handle/11143/75

► Résumé : La décomposition des litières végétales a été décrite comme étant la deuxième plus importante fonction écosystémique sur terre, après la productivité primaire. Alors… (more)

▼ Résumé : La décomposition des litières végétales a été décrite comme étant la deuxième plus importante fonction écosystémique sur terre, après la productivité primaire. Alors que la photosynthèse fournit les apports énergétiques à la plupart des chaînes alimentaires, la décomposition recycle les nutriments, permet leur utilisation future par d’autres organismes et relargue dans l’atmosphère le carbone fixé photosynthétiquement. Dans un contexte de changement climatique, un grand intérêt est porté sur la décomposition des litières, car il s’agit, à l’échelle globale, de la plus grande source d’émission de CO[indice inférieur 2] dans l’atmosphère. Les taux de décomposition des litières sont principalement déterminés par trois facteurs: les variables climatiques, la structure des communautés de décomposeurs et les propriétés chimiques et physiques de la litière. La structure de la communauté végétale hôte dans laquelle se produit la décomposition et d’où provient la litière peut influencer l’ensemble de ces trois facteurs. Des changements dans la structure de la communauté végétale pourraient donc affecter les futurs taux de décomposition et modifier significativement les dynamiques globales du carbone. Malgré cela, la communauté hôte est rarement prise en compte dans les études sur la décomposition des litières. Des expériences enlèvent souvent la litière de son environnment naturel de décomposition, mesurant la décomposition des litières à partir de monolithes ou de microcosmes en laboratoire, afin de contrôler les variations indésirables des propriétés du sol. Dans ce mémoire, j’étudie les effets de plusieurs propriétés fonctionnelles de la communauté végétale hôte sur les taux de décomposition des litières et leur contribution à la respiration du sol. En utilisant une plantation expérimentale d’arbres qui permet de manipuler la structure de leur communauté, je teste l’effet de l’identité fonctionnelle des arbres, des espèces et de la diversité fonctionnelle, ainsi que des interactions entre décomposeurs et arbres sur ces processus écosystémiques. La décomposition des litières et la respiration du sol sont liées aux propriétés fonctionnelles des plantes. La décomposition des litières est bien prédite par les valeurs moyennes de traits fonctionnels des litières, mais plus faiblement corrélée à la diversité spécifique. D’après mes résultats, le nombre d’espèces en mélange de litières ne constitue pas un facteur important pour la décomposition, à cause des interactions globalement idiosyncratiques entre types de litières. Cependant, l’augmentation conjointe de la diversité fonctionnelle des mélanges d’espèces en litières et de la communauté d’arbres-hôtes accélère les taux de décomposition et la respiration du sol. Les premières phases de décomposition de litières en surface ne sont que faiblement affectées par la diversité des plantes, alors que pour la respiration du sol, qui prend en compte les dernières phases de décomposition de litière et de matière organique du sol, la diversité est la propriété fonctionnelle de… Advisors/Committee Members: Shipley, John-William (advisor).

Subjects/Keywords: Décomposition de la litière; Respiration du sol; Fonctionnement des écosystèmes et biodiversité; Traits agrégés de communauté; Hypothèse du biomass-ratio; Home-field advantage; Diversité fonctionnelle; Traits fonctionnels; Interactions plantes-sol; Litter decomposition; Soil respiration; Biodiversity-ecosystem functioning; Community-weighted means; Mass-ratio hypothesis; Functional diversity; Functional traits; Plant-soil interactions

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Jewell, M. (2014). Diversité des arbres, interactions aériennes et souterraines et décomposition des feuilles mortes . (Masters Thesis). Université de Sherbrooke. Retrieved from http://savoirs.usherbrooke.ca/handle/11143/75

Chicago Manual of Style (16^th Edition):

Jewell, Mark. “Diversité des arbres, interactions aériennes et souterraines et décomposition des feuilles mortes .” 2014. Masters Thesis, Université de Sherbrooke. Accessed December 13, 2019. http://savoirs.usherbrooke.ca/handle/11143/75.

MLA Handbook (7^th Edition):

Jewell, Mark. “Diversité des arbres, interactions aériennes et souterraines et décomposition des feuilles mortes .” 2014. Web. 13 Dec 2019.

Vancouver:

Jewell M. Diversité des arbres, interactions aériennes et souterraines et décomposition des feuilles mortes . [Internet] [Masters thesis]. Université de Sherbrooke; 2014. [cited 2019 Dec 13]. Available from: http://savoirs.usherbrooke.ca/handle/11143/75.

Council of Science Editors:

Jewell M. Diversité des arbres, interactions aériennes et souterraines et décomposition des feuilles mortes . [Masters Thesis]. Université de Sherbrooke; 2014. Available from: http://savoirs.usherbrooke.ca/handle/11143/75

Montana Tech

18. Reid, Brian. Energy Flow in a Floodplain Aquifer Ecosystem.

Degree: PhD, 2007, Montana Tech

URL: https://scholarworks.umt.edu/etd/372

► We developed an energy budget to identify energy sources for the invertebrate community of a large 20 km2 floodplain aquifer, based on biomass distributions, organismal… (more)

▼ We developed an energy budget to identify energy sources for the invertebrate community of a large 20 km2 floodplain aquifer, based on biomass distributions, organismal respirometry, in situ community respiration, mesocosm and microcosm experiments, stable isotopes and invertebrate gut contents. The invertebrate respiration scaling exponent was 0.474 (+/- 0.068, 95% CI) across six orders in body mass, which is significantly lower than the ¾ power scaling predicted by metabolic theory. Invertebrate production was dominated by copepods (Diacyclops, Acanthocyclops, Bryocamptus), Stygobromus amphipods, and amphibiont stoneflies, and ranged from 26.9 to 4200 mg C/m3 sediment/year. Production and density showed a U-shaped response to dissolved oxygen (high production at both low and high oxygen concentrations). Production declined exponentially with depth for most sites, but at sites with orthograde oxygen profiles there was an exponential increase at the oxycline. Aerobic microbial community production ranged from 1210 to 2020 mg C/m3 sediment/year, also showing a U-shaped response to oxygen. System respiratory quotient (RQ) ranged from ≈ 0 to 9.5, indicating a significant contribution of anaerobic production to system energy flow. We documented multiple lines of evidence for DOC (soil, river) and buried POM carbon sources, however POM was by far the largest carbon reservoir in the aquifer at ≈ 108 (to 1010) mg C/ m3 sediment. Energy from POM breakdown was the only source sufficient to explain microbial and invertebrate production. Carbon stable isotope signatures showed strong levels of depletion for invertebrates (δ13C -25‰ to -70‰). These results suggest a significant anaerobic subsidy of aerobic food webs in the subsurface, and a potential methane subsidy of 10% to 99% of invertebrate energy flow. Oxygen showed high, non-random, spatial and temporal variation across the aquifer, with a large scale decline in oxygen along the axis of the floodplain, and distinct hotspots of low oxygen. Low oxygen hotspots corresponded with migration of stonefly nymphs 100’s of meters into the aquifer. The U-shaped responses and biogeochemical trends suggest a major threshold at bulk oxygen concentrations of 3-5 mg/l. Collectively, these findings indicate the role of dissolved oxygen as a key variable in groundwater ecosystems.

Subjects/Keywords: Aquifer Organic Matter; Community Respiration; Dissolved Oxygen Sytematics; Energy Flow; Hyporheic Mesocosm; Hyporheic Zone; Metabolic Scaling

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Reid, B. (2007). Energy Flow in a Floodplain Aquifer Ecosystem. (Doctoral Dissertation). Montana Tech. Retrieved from https://scholarworks.umt.edu/etd/372

Chicago Manual of Style (16^th Edition):

Reid, Brian. “Energy Flow in a Floodplain Aquifer Ecosystem.” 2007. Doctoral Dissertation, Montana Tech. Accessed December 13, 2019. https://scholarworks.umt.edu/etd/372.

MLA Handbook (7^th Edition):

Reid, Brian. “Energy Flow in a Floodplain Aquifer Ecosystem.” 2007. Web. 13 Dec 2019.

Vancouver:

Reid B. Energy Flow in a Floodplain Aquifer Ecosystem. [Internet] [Doctoral dissertation]. Montana Tech; 2007. [cited 2019 Dec 13]. Available from: https://scholarworks.umt.edu/etd/372.

Council of Science Editors:

Reid B. Energy Flow in a Floodplain Aquifer Ecosystem. [Doctoral Dissertation]. Montana Tech; 2007. Available from: https://scholarworks.umt.edu/etd/372

Virginia Tech

19. Heckman, John Richard. Restoration of Degraded Land: A comparison of Structural and Functional Measurements of Recovery.

Degree: PhD, Biology, 1997, Virginia Tech

URL: http://hdl.handle.net/10919/30298

► The main goals of this study were to document the structural and functional recovery of differently restored areas, to understand better the relationship between the… (more)

▼ The main goals of this study were to document the structural and functional recovery of differently restored areas, to understand better the relationship between the two, and to determine which types of measurements are best for assessing restoration success. To address these questions, an experimental system was created through topsoil removal and subsequent restoration in a blocked, completely randomized design using two levels of soil amendment (with or without 10 kg of leaf mulch per square meter) and three levels of seeding treatment (no seed, a standard reclamation mix, and an alternative, wildflower dominated reclamation mix). All measurements were designed to document responses due to restoration treatment in comparison to adjacent, undisturbed, reference sites. Vegetation structure in amended sites, as measured by total vegetation cover and species richness, recovered to levels similar to references within the two years of the study. Plant community composition did not develop similarity to references in any experimental treatments. Both soil amendment and seeding type affected cellulose decomposition rates, with amended plots showing higher decomposition rates than unamended, and seeded plots exhibiting higher rates than unseeded. Enzyme activities were largely determined by soil amendment, but the reference plots consistently had higher enzymatic activity. Amended sites exhibited significant increases over time in soil respiration, reaching or surpassing the rates observed in reference areas. Methane oxidation rates were generally increased in disturbed plots compared to undisturbed references due to increased atmospheric diffusion into the soil. Amended areas exhibited depressed rates relative to unamended, and seeding level had no significant effect on methane oxidation. Over all measurements, restoration of ecosystem function was most facilitated by the addition of the soil amendment. Seeding treatment significantly altered the resultant plant community, which may have substantial, long-term consequences for succession. The inclusion of functional parameters into restoration assessment provides for better overall information concerning ecosystem performance and may add to the ability to predict long-term success of restoration efforts. Advisors/Committee Members: Cairns, John Jr. (committeechair), Daniels, Walter Lee (committee member), Cowles, Joseph R. (committee member), Nilsen, Erik T. (committee member), Smith, Eric P. (committee member).

Subjects/Keywords: ecological restoration; plant community recovery; soil enzymes; cellulos decomposition; soil respiration; atmospheric methane uptake; ecosystem services

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Heckman, J. R. (1997). Restoration of Degraded Land: A comparison of Structural and Functional Measurements of Recovery. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/30298

Chicago Manual of Style (16^th Edition):

Heckman, John Richard. “Restoration of Degraded Land: A comparison of Structural and Functional Measurements of Recovery.” 1997. Doctoral Dissertation, Virginia Tech. Accessed December 13, 2019. http://hdl.handle.net/10919/30298.

MLA Handbook (7^th Edition):

Heckman, John Richard. “Restoration of Degraded Land: A comparison of Structural and Functional Measurements of Recovery.” 1997. Web. 13 Dec 2019.

Vancouver:

Heckman JR. Restoration of Degraded Land: A comparison of Structural and Functional Measurements of Recovery. [Internet] [Doctoral dissertation]. Virginia Tech; 1997. [cited 2019 Dec 13]. Available from: http://hdl.handle.net/10919/30298.

Council of Science Editors:

Heckman JR. Restoration of Degraded Land: A comparison of Structural and Functional Measurements of Recovery. [Doctoral Dissertation]. Virginia Tech; 1997. Available from: http://hdl.handle.net/10919/30298

20. Black, Christopher Kyle. Plant root contributions to the carbon balance of a changing agricultural Midwest.

Degree: PhD, Plant Biology, 2016, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/95339

► The long-term carbon balance of the agricultural Midwestern United States will depend on the interactions between climate, land use decisions, plant biology, and biogeochemistry. In… (more)

▼ The long-term carbon balance of the agricultural Midwestern United States will depend on the interactions between climate, land use decisions, plant biology, and biogeochemistry. In agricultural systems, C storage is fully determined by belowground pools, so it is vital to understand the links between root placement and C status under a variety of potential future conditions and land use types. I considered three such links: the long-term trajectory of soil C in a conventional maize-soybean rotation subjected to climate change, the potentially major increase in root C inputs associated with a change from row crops to high-yielding perennial grasses (Miscanthus × giganteus and Panicum virgatum), and the taxonomic partitioning of vertical niche space in a restored prairie. To determine the effect of climate change on soil C in conventional row crop agriculture, I measured root and soil respiration under soybeans and maize grown under elevated temperature (ambient + ~2 °C) and elevated CO2 (+200 ppm) for three years, then used a process-based ecosystem model (DayCent) to extend these observations and infer long-term changes in soil C. Heating and CO2 both increased microbial respiration by ~20%, and heating reduced root respiration by ~25%. Particulate organic matter was lower in elevated CO2 plots, possibly indicating a CO2 priming effect on the loss of old soil carbon. DayCent results agreed with heated-plot observations but did not resolve the speculated CO2 priming effect, because the model has no mechanism to simulate priming. Over the next several decades, I predict a substantial loss of C from agricultural soils. To clarify differences in root architecture between several potential biofuel crops, I collected minirhizotron images from 0-100 cm depth over five growing seasons from a maize-maize-soybean row crop rotation and from three perennial grasses. I developed a Bayesian statistical model that accounts for near-surface underdetection effects and correctly handles the frequent zero counts typical of minirhizotron data. The model performed well against direct measurements from deep cores and allowed improved inferences about the amount of root allocated to each soil layer and how it changes through time. Mature perennial crops showed little change in relative allocation through time, but total root volume of perennial grasses increased dramatically from 2010 to 2014 and showed little change during a historic drought in 2012, implying that these large, deep root systems confer drought tolerance. By growing exceptionally large, fine, highly-dispersed root systems that sent substantial amounts of C into very deep soil, land use conversion from row crops to perennial grass biofuels is likely to create a large and persistent C sink. To learn how species arrange themselves in space within complex communities and infer their roles in C cycling, I used a DNA metabarcoding approach to identify the ITS2 sequences of taxa present in mixed root samples from varying depths (0-10, 10-30, 30-50, 50-75, 75-100 cm) in a… Advisors/Committee Members: DeLucia, Evan H (advisor), DeLucia, Evan H (Committee Chair), Bernacchi, Carl J (committee member), Davis, Sarah C (committee member), Leakey, Andrew DB (committee member).

Subjects/Keywords: SoyFACE; Climate change; Warming; Priming; Soil respiration; DayCent; Minirhizotron; Stan; Bayesian modeling; Root volume; Root allocation; Miscanthus; Panicum virgatum; Prairie; Zea mays; Glycine max; Niche partitioning; DNA metabarcoding; Grassland; Root community; Biodiversity

4 more images…

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Black, C. K. (2016). Plant root contributions to the carbon balance of a changing agricultural Midwest. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/95339

Chicago Manual of Style (16^th Edition):

Black, Christopher Kyle. “Plant root contributions to the carbon balance of a changing agricultural Midwest.” 2016. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed December 13, 2019. http://hdl.handle.net/2142/95339.

MLA Handbook (7^th Edition):

Black, Christopher Kyle. “Plant root contributions to the carbon balance of a changing agricultural Midwest.” 2016. Web. 13 Dec 2019.

Vancouver:

Black CK. Plant root contributions to the carbon balance of a changing agricultural Midwest. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2016. [cited 2019 Dec 13]. Available from: http://hdl.handle.net/2142/95339.

Council of Science Editors:

Black CK. Plant root contributions to the carbon balance of a changing agricultural Midwest. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2016. Available from: http://hdl.handle.net/2142/95339

University of Windsor

21. Daly, Christine A. Carbon sources, microbial community production, and respiration in constructed wetlands of the Alberta, Canada oil sands mining area.

Degree: MS, Earth and Environmental Sciences, 2007, University of Windsor

URL: https://scholar.uwindsor.ca/etd/6974

Subjects/Keywords: ALBERTA; AREA; CANADA; CARBON; COMMUNITY; CONSTRUCTED; MICROBIAL; MINING; OIL; PRODUCTION; RESPIRATION; SANDS; SOURCES; WETLANDS

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Daly, C. A. (2007). Carbon sources, microbial community production, and respiration in constructed wetlands of the Alberta, Canada oil sands mining area. (Masters Thesis). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/6974

Chicago Manual of Style (16^th Edition):

Daly, Christine A. “Carbon sources, microbial community production, and respiration in constructed wetlands of the Alberta, Canada oil sands mining area.” 2007. Masters Thesis, University of Windsor. Accessed December 13, 2019. https://scholar.uwindsor.ca/etd/6974.

MLA Handbook (7^th Edition):

Daly, Christine A. “Carbon sources, microbial community production, and respiration in constructed wetlands of the Alberta, Canada oil sands mining area.” 2007. Web. 13 Dec 2019.

Vancouver:

Daly CA. Carbon sources, microbial community production, and respiration in constructed wetlands of the Alberta, Canada oil sands mining area. [Internet] [Masters thesis]. University of Windsor; 2007. [cited 2019 Dec 13]. Available from: https://scholar.uwindsor.ca/etd/6974.

Council of Science Editors:

Daly CA. Carbon sources, microbial community production, and respiration in constructed wetlands of the Alberta, Canada oil sands mining area. [Masters Thesis]. University of Windsor; 2007. Available from: https://scholar.uwindsor.ca/etd/6974

University of Tasmania

22. Clapcott, JE. The metabolic signature of small headwater streams: Natural variability and the response to forestry.

Degree: 2007, University of Tasmania

URL: https://eprints.utas.edu.au/7872/1/01Front.pdf ; https://eprints.utas.edu.au/7872/2/02Whole.pdf ; https://eprints.utas.edu.au/7872/3/AMMENDUM_100109.pdf

► A strong connection to the landscape means that small headwater stream metabolism is easily disturbed by land management practices such as forestry. A current landscape… (more)

▼ A strong connection to the landscape means that small headwater stream metabolism is easily disturbed by land management practices such as forestry. A current landscape ecology framework, the hierarchical patch dynamics paradigm, was applied to examine the heterogeneity of small headwater stream metabolism and how it is affected by anthropogenic disturbance. Metabolism was examined at several scales to elucidate specific metabolic components and processes, including microbial community structure, bacterial carbon productivity, cellulose decomposition potential, algal accumulation, and ecosystem respiration and productivity. Firstly, in-stream metabolic patch dynamics was examined throughout a calendar year. Small headwater streams displayed very low metabolic rates dominated by heterotrophic processes. Predictable spatial and temporal patterns in population-level, community-level, and whole system-level metabolisms were observed, shaped by temperature, hydrology, and the physical and chemical properties of patches. Secondly, an inundation experiment was conducted to examine metabolic patch dynamics in a small headwater landscape. Inundation resulted in increased metabolic response and a change in the metabolic community profile of the terrestrial patch. It is suggested that regular, above-bank flows are likely to transfer the complexities of in-stream patch dynamics into the terrestrial environment, exemplifying the strong connection between headwater streams and the surrounding landscape. Thirdly, the impact of forestry on stream metabolism was examined by a survey of small headwater streams 2-5 years after logging. Forestry stimulated autotrophy and lead to increased metabolic rates. Methods that incorporate temporal variability, such as cellulose decomposition potential, provided a strong assessment of forestry impact and are recommended as robust indicators of disturbance. Fourthly, the potential recovery of stream metabolism from the impacts of forestry was examined by a survey of small headwater streams 2-15 years after logging. Only autotrophic processes displayed recovery over time, with a sustained change in heterotrophic form and function. It is suggested that, together, these surveys demonstrate a lack of resistance and resilience to forestry disturbance in the key metabolic processes of small headwater streams. Finally, through the description of metabolic patterns a metabolic ‘signature’ of small headwater streams is presented. The metabolic signature provides a characterisation of small headwater stream metabolism and contributes to our understanding of small headwater stream ecology.

Subjects/Keywords: headwater stream metabolism; land management practices; anthropogenic disturbance; microbial community; bacterial carbon productivity; cellulose decomposition; algal accumulation; ecosystem respiration; impact of forestry; logging.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Clapcott, J. (2007). The metabolic signature of small headwater streams: Natural variability and the response to forestry. (Thesis). University of Tasmania. Retrieved from https://eprints.utas.edu.au/7872/1/01Front.pdf ; https://eprints.utas.edu.au/7872/2/02Whole.pdf ; https://eprints.utas.edu.au/7872/3/AMMENDUM_100109.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Clapcott, JE. “The metabolic signature of small headwater streams: Natural variability and the response to forestry.” 2007. Thesis, University of Tasmania. Accessed December 13, 2019. https://eprints.utas.edu.au/7872/1/01Front.pdf ; https://eprints.utas.edu.au/7872/2/02Whole.pdf ; https://eprints.utas.edu.au/7872/3/AMMENDUM_100109.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Clapcott, JE. “The metabolic signature of small headwater streams: Natural variability and the response to forestry.” 2007. Web. 13 Dec 2019.

Vancouver:

Clapcott J. The metabolic signature of small headwater streams: Natural variability and the response to forestry. [Internet] [Thesis]. University of Tasmania; 2007. [cited 2019 Dec 13]. Available from: https://eprints.utas.edu.au/7872/1/01Front.pdf ; https://eprints.utas.edu.au/7872/2/02Whole.pdf ; https://eprints.utas.edu.au/7872/3/AMMENDUM_100109.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Clapcott J. The metabolic signature of small headwater streams: Natural variability and the response to forestry. [Thesis]. University of Tasmania; 2007. Available from: https://eprints.utas.edu.au/7872/1/01Front.pdf ; https://eprints.utas.edu.au/7872/2/02Whole.pdf ; https://eprints.utas.edu.au/7872/3/AMMENDUM_100109.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Swedish University of Agricultural Sciences

23. Dehlin, Helena. Ecosystem functioning and plant-soil interactions in forests.

Degree: 2006, Swedish University of Agricultural Sciences

URL: http://pub.epsilon.slu.se/1208/

► The aim of this thesis was to investigate the role of resources in driving ecosystem processes and in influencing soil- and plant communities in boreal… (more)

▼ The aim of this thesis was to investigate the role of resources in driving ecosystem processes and in influencing soil- and plant communities in boreal and temperate forests, through four complementary experimental studies. In the first study, plant and soil microbial responses to the quality and diversity of added organic substrates from boreal forests were investigated. The substrate-diversity effects were greatest for plants and depended on the presence of high-quality substrates. In the second study, the impact of fire disturbance in boreal forests on litterfall composition and decomposition rates was assessed along a fire chronosequence, by collecting litterfall data and performing a litterbag experiment. Time since last fire reduced tree litterfall quality by increasing the proportion of twigs (low-quality litter) in the litterfall and this resulted in a decline in overall litter decomposition rates. In the third study, effects of resource availability on the performance of coexisting boreal tree seedlings were examined by growing seedlings in pots with low- and high fertility soil under different light filters. The growth and mycorrhizal colonisation of seedlings in response to light and soil conditions differed between species, which affected the relative competitive abilities of the seedling species. In the fourth study, impacts of different canopy tree species on tree seedling recruitment and soil communities were assessed by planting seedlings in stands of native and invasive tree species in temperate forests. Treatments were applied to test for effects of mycorrhizal connections and root competition from canopy trees on seedling performance. Tree seedlings were unaffected by root competition and mycorrhizal treatments, but both seedlings and soil organisms were strongly affected by canopy species identity through influences on the microenvironment. In combination, these studies demonstrate different mechanisms for how resources may influence nutrient dynamics, soil communities and tree seedling recruitment in forests, i.e. through regulating decomposer activities and decomposition rates, nutrient cycling, mycorrhizal colonisation, plant growth, and through influencing feedbacks between soil- and plant communities. These studies are also relevant for a better understanding of global change issues such as impacts of invasive species, biodiversity loss, and increased carbon sequestration.

Subjects/Keywords: boreal forests; forest litter; degradation; seedlings; forest trees; growth; soil microorganisms; mycorrhizae; plant cover; plant soil relations; soil fertility; Boreal forest; decomposition; litter-mixing; light; mycorrhiza; microbial community; plant productivity; regeneration; substrate-induced respiration; tree seedling

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APA (6^th Edition):

Dehlin, H. (2006). Ecosystem functioning and plant-soil interactions in forests. (Doctoral Dissertation). Swedish University of Agricultural Sciences. Retrieved from http://pub.epsilon.slu.se/1208/

Chicago Manual of Style (16^th Edition):

Dehlin, Helena. “Ecosystem functioning and plant-soil interactions in forests.” 2006. Doctoral Dissertation, Swedish University of Agricultural Sciences. Accessed December 13, 2019. http://pub.epsilon.slu.se/1208/.

MLA Handbook (7^th Edition):

Dehlin, Helena. “Ecosystem functioning and plant-soil interactions in forests.” 2006. Web. 13 Dec 2019.

Vancouver:

Dehlin H. Ecosystem functioning and plant-soil interactions in forests. [Internet] [Doctoral dissertation]. Swedish University of Agricultural Sciences; 2006. [cited 2019 Dec 13]. Available from: http://pub.epsilon.slu.se/1208/.

Council of Science Editors:

Dehlin H. Ecosystem functioning and plant-soil interactions in forests. [Doctoral Dissertation]. Swedish University of Agricultural Sciences; 2006. Available from: http://pub.epsilon.slu.se/1208/

University of Florida

24. Schooley, James K ( James Kenneth ), 1951-. The structure and function of warm temperate estuarine fish communities.

Degree: 1980, University of Florida

URL: http://ufdc.ufl.edu/AA00029881

Subjects/Keywords: Community structure; Crops; Fish; Impoundment; Lagoons; Production efficiency; Production estimates; Respiration; Salinity; Water temperature; Fish populations – Florida; Fishes – Ecology – Florida; Fishes – Effect of water quality on – Florida; Zoology thesis Ph. D

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Schooley, James K ( James Kenneth ), 1. (1980). The structure and function of warm temperate estuarine fish communities. (Thesis). University of Florida. Retrieved from http://ufdc.ufl.edu/AA00029881

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Schooley, James K ( James Kenneth ), 1951-. “The structure and function of warm temperate estuarine fish communities.” 1980. Thesis, University of Florida. Accessed December 13, 2019. http://ufdc.ufl.edu/AA00029881.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Schooley, James K ( James Kenneth ), 1951-. “The structure and function of warm temperate estuarine fish communities.” 1980. Web. 13 Dec 2019.

Vancouver:

Schooley, James K ( James Kenneth ) 1. The structure and function of warm temperate estuarine fish communities. [Internet] [Thesis]. University of Florida; 1980. [cited 2019 Dec 13]. Available from: http://ufdc.ufl.edu/AA00029881.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Schooley, James K ( James Kenneth ) 1. The structure and function of warm temperate estuarine fish communities. [Thesis]. University of Florida; 1980. Available from: http://ufdc.ufl.edu/AA00029881

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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Open Access Theses and Dissertations